Disk harrow



FIG. 1 is an upper left perspective view of a disk harrow showing our new design in use condition;

FIG. 2 is an upper left perspective view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a left side view thereof; and,

FIG. 6 is a rear view thereof.

The broken line showing of the wheels, disks, and small mechanical elements attached to the harrow in FIG. 1 and the small brackets in FIGS. 1-5 is included for the purpose of illustrating environmental structure and forms no part of the claimed design. 

We claim the ornamental design for a disk harrow, as shown and described. 